[Usaco2010 Jan]island
时间限制：1s 空间限制：64MB
题目描述
一个字符矩阵，'.'为海洋，'A'为主岛，'x'为其它岛，保证所有'A'构成一个联通块，画一个圈，使得所有的'A'在圈内，所有的'x'在圈外，更具体的看样例，求这样的圈的最小周长
输入格式
Line 1: Two space-separated integers: H and W * Lines 2..H+1: Line i+1 contains contains W characters that are the elements of map row i (all '.' or 'x' or 'A')
输出格式
* Line 1: The minimum length of a path that Farmer John's cruise ship can take
样例输入
12 19 ................... ................... .....A............. .....A..x.......... ..x..A.....AAAA.... .....A.....A..A.... .....AAAAAAAA.A.... ........A.....A.... .xx...AAA...x.A.... ......A............ ...AAAAAAAAAAAAA... ...................
样例输出
62
提示
没有写明提示
题目来源
Gold